First slide

The lens

Question

A point object O is placed in front of a glass rod having spherical end of radius of curvature 30 cm. The image would be formed at

Moderate

A

30 cm left
B

Infinity
C

1 cm to the right
D

18 cm to the left

Solution

By using formula $\frac{μ_{2}}{v} - \frac{μ_{1}}{u} = \frac{μ_{2} - μ_{1}}{R}$
$\Rightarrow \frac{1 .5}{v} - \frac{1}{(- 15)} = \frac{(1 .5 - 1)}{+ 30} \Rightarrow v = - 30 cm$
Negative sign shows that, image is obtained on the same side of object i.e. towards left.

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